含横向裂缝混凝土氯盐侵蚀所致锈裂面的细观分析  

Meso-analysis of the rust cracked surface of concrete with transverse cracks caused by chloride salt erosion

作　　者：金浩 李政 余朔 JIN Hao;LI Zheng;YU Shuo(School of Transportation,Southeast University,211189 Nanjing,China;The Key Laboratory of Road and Traffic Engineering,Ministry of Education,Tongji University,201804 Shanghai,China;Power China Huadong Engineering Corporation Limited,311122 Hangzhou,China)

机构地区：[1]东南大学交通学院,南京211189 [2]同济大学道路与交通工程教育部重点实验室,上海201804 [3]中国电建集团华东勘测设计研究院有限公司,杭州311122

出　　处：《应用力学学报》2022年第3期572-582,共11页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(No.51908428);江苏省自然科学基金(No.BK20211173)。

摘　　要：为了更精确地分析氯盐侵蚀下含横向裂缝混凝土的锈胀开裂规律,考虑混凝土骨料的几何本征特性,利用激光扫描及图像处理技术获取混凝土的真实骨料库;在此基础上建立了扩散与应力耦合的三维细观锈胀开裂计算模型,分析了锈裂面的几何形态,并研究了锈裂面的宽度、角度与骨料体积率及骨料比表面积的关系。研究表明:在含横向裂缝的混凝土试块中,氯盐侵蚀所致的锈蚀开裂面均为“双月牙”形态,且开裂面形态随骨料比表面积增大呈现较强的不对称性;锈裂面的最大宽度随骨料体积率减小而增大,当骨料体积率增大到20%,开裂面最大宽度基本保持不变;锈裂面的最大夹角位于混凝土横向裂缝正下方,当骨料比表面积为0.160~0.197 m;/kg时,锈裂面的最大夹角范围为144°~160°。In order to more accurately analyze the rust expansion and cracking law of concrete with transverse cracks under chloride erosion,this paper considers the geometric intrinsic characteristics of concrete aggregates,uses laser scanning and image processing technology to obtain the real aggregate library of concrete;build on this basis A three-dimensional mesoscopic rust expansion and cracking calculation model coupled with diffusion and stress was developed.The geometry of the rust crack surface was analyzed,and the relationship between the width and angle of the rust crack surface and the volume rate of aggregate and the specific surface area of the aggregate was studied.The research shows that in the concrete specimens with transverse cracks,the corrosion cracked surfaces affected by chloride salt are all in the form of“double crescent”,and the form of the cracked surfaces presents a strong asymmetry as the aggregate specific surface area increases.The maximum width of the rust cracked surface increases with the decrease of the aggregate volume rate.When the aggregate volume rate is increased to 20%,the maximum width of the cracked surface remains basically unchanged.The maximum included angle of the rust cracked surface is directly below the concrete transverse crack.When the aggregate specific surface area is 0.160-0.197 m~2/kg,the maximum included angle of the rust cracked surface ranges from 144°-160°.

关 键 词：细观模型 钢筋锈蚀 开裂面形态 真实骨料 横向裂缝 

分 类 号：TU43[建筑科学—岩土工程]